What would have to be taken out first in a conflict with DPRK is the missiles they have aimed at Seoul.
I bet that we have the plans to Kim's underground bunkers. They will do him little good if things on the surface go our way.
Actually there is quite a detailed plan of a potential assault on North Korea by US and South Korean forces...that was made public....and the North Koreans refer to it many times, angrily, in their official KCNA news agency.